Synchronizing system



Aug. 30, 1932. v s. RUMP 1,373,931

SYNCHRONIZING SYSTEI Filed Dec. 3, 1950 lllll g Patented Aug. 30, 1932 UNITED STATES BIGUBD BUMP, OF ZURICH, SWITZERLAND sYn'cnnomzme sxs'rnm Application. filed December 3, 1930, Serial No.

This invention relates to an improved system for synchronizing or retaining electric current generators in synchronism.

The present invention provides a means for Bjretaining electric current generators in syn chronism when continuously connected to a common distribution line by regulation of the prime mover of all but one of the generators. Such result has been heretofore at- 10, tained by the continuous connection of a synchronizing arrangement which was con trolled jointly by the desired operating frequency of the line and a frequency corre sponding to the speed of an auxiliary genera tor whichwas coupled with the generator to be synchronized. When the generators became asynchronous, the-auxiliary generator varied in speed and its frequency varied relative to the line frequency. Such frequency differences operated a contact device such as a rotary synchronoscope, the torque of which was used to regulate the speed of the prime mover of the generator. Numerous disadvantages are apparent for such synchronizing systems.

It is, therefore, among the objects of the present invention to provide a system for retaining generators in synchronism in which system the prime mover operating one of the generators is regulated.

Another object of the invention is to provide a system for retaining generators in synchronism in whichthe auxiliary generator need not be provided with direct current excitation.

Another object of the invention'is to provide a system for retaining generators in synchronism in which system the prime mover operating one of the generators is regulated by a relay connected between the line and the auxiliary generator. I

Another object of the invention is to.pro vide a system for retaining generators in synchronism in which system the prime mover operating one of the generators is regulated by a relay operated in dependence on the energy flow between the network and the auxiliary generator.

Objects and advantages, other than those above set forth, be apparent from the pendent on the position of contacts 13.

49 ,628, and in Germany December 5, 1929.

following description when read in connection with the accompanying drawing which diagrammatically illustrates one embodiment of the present invention.

Referring more particularly to the drawing by characters of reference, the reference numeral 1 designates a portion of a distribu tion line supplied from a main generator 2. A11 auxiliary generator 3, l of the slipring induction type is driven by the shaft of generator 1. The stator winding 4 of the auxiliary generator is energized from a transformer 6 connected with line 1. Both of the generators are driven by a turbine or other suitable prime mover 7 to which the supply of the operating medium is controlled by a valve 8. The valve 8 is operated over a suitable drive 9 from a motor 11, 12. The terminals of the rotor 11 are connected with the movable contacts 13 of aregulator moving over the resistances 14, 15 connected in parallel and connected in series with field winding 12 of the motor which is connected with a source of current 17 Contacts 13 of the regulator is operated by the co-action of a current coil 18 and a voltage coil. 19 connected through transformers 21 and 22 with the transformer 6 and stator 4 to impress a voltage on the rotor 11 of a magnitude and direction. de

motor regulator is preferably returnable to its neutral position by a suitable spring (not shown).

As long as the speed and hence the frequen cy of the auxiliary generator 3, 4t corresponds to the line frequency, there is no energy flow between the auxiliary generator and the network and the regulator therefore does not operate. As soon, however, as a frequency difference appears, energy flows between transformer 6 and the auxiliary generator and the regulator operates thereby initiating' rotation of the motor 11, 12 in either direction which adjusts valve 8 and hence regulates the speed of the turbine 2. As soon as the frequencies are again the same, the flow of energy from transformer 6 to generator 3, 4

. ceases and the regulator is returned to the neutral position whereupon motor 11, 12 and valve 8 remain in the position which they have reached. The sensitivity of the regulator is increased by keeping the no-load losses of'the auxiliary generator small and by making its output, at a given slip frequency, as large as is possible.

Although but one embodiment of the presators, and means connected with and operated by energy flow in the stator winding of said auxiliary generator to control the speed of said prime mover.-

2. In a system for retaining generators in synchronism, a main generator, an auxiliary generator having a rotor and a stator winding, the stator winding of said auxiliary generat'or being connected, with said main generator, a prime mover operating'said generators, and a regulator. operating in depend -ence on the direction of energy flow in the stator winding of said auxiliary generator to control the speed of said prime mover.

3. Ina system for retaining generators in synchronism, a main generator, an auxiliary generator having a rotor and a stator winding, the stator winding of said auxiliary gen-,

erator being connected with said main generator, a prime mover operating said ener- 0 ators, a motor controlling the supply 0 operating medium to said prime mover, and a reglilator operatin .in dependence on the direction of energy ow in the stator windings of said auxiliary generator to control the operation of-said motor.- r

4. In a system: for retaining generators in synchronism, a main. generator, an aum'l- "iary generator having a rotor and a stator -winding, the-stator winding of said auxiliary generator being connected with said main generator, 2. primemover operatin said, I generators, a motor 0 erable'm either irecv e supply of'operatmg tion-for controlling t medium to said prime mover, and a regulator erators, and meansconnected between said terminals and said llne operative to control the speed of said prlme mover in-response to the direction of energy flow between said rent to said line, an auxiliary generato'rfa transformer connecting the output circuit terminals of said auxiliary generator with said 2 line, a prime mover driving said generators, a regulator havinga plurality of operating coils, said regulator controlling the speed of said prime mover, and means connecting the coils of said regulator with said terminals and with said transformer to cause operation of said regulator in response to the direction of energy flow between said auxiliary generator and said transformer.

v7. In a system for retaining generators in synchronism an alternatingcurrentline, a generator connected with and supplying current to said line, an auxiliary generator, a transformer connecting the output circuit terminals of said auxiliary generator with said line, a prime mover driving said generators, a regulator having a current coil and a volt age coil, said regulator controlling the speed of said prime mover, a current transformer connected with the said current coil and between said terminals and the first said transformer, and a voltage transformer connected with the volteiige coil and between said terminals and the rst said transformer. .In testimony whereof I have hereunto subscribed my A. n. 193 SIGUBD BUMP.

operating in dependence on the direction of energyflow in the stator winding of said aux iilrary generator to control the operation of said motor in either direction of rotation.

generator connected with: and supplyingcurrent to said line, an 'r'mxiliaiy generator,-a

terminals'of said a 'ary 5. In a' system i'or retaining generators in synchronism, "an "alternating current line, 'a'

name this 19th day of November Y no 

